Automatic selector device for a multi-gear change-speed gearbox

An automatic selector device for a multi-gear change-speed gearbox in which are provided gear selectors actuatable by selector actuators of axial piston type in order to form a desired gear, an electronic control unit, a multi-path valve common to the selector actuators and an electromotive valve actuator operatively connected to the control unit and multi-path valve so as to be responsive to the control unit for actuating the multi-path valve, the multi-path valve having, for each gear, an associated valve position in which the respective selector actuator is connected to an operating pressure source, wherein a 3-position cylinder with a double-acting axial piston constitutes the selector actuator for two adjacent gears, and a 4/3-way selector valve is operatively connected to each 3-position cylinder to switch on and off operating pressure of each 3-position cylinder, the 4/3-way selector valve being operatively connected to the multi-path valve so as to be actuatable by a control pressure force supplied via the multi-path valve, a main pressure conduit being independently operatively connected to each selector valve, which main pressure conduit is configured to be at a high pressure level, and an auxiliary pressure conduit is operatively connected to the multi-path valve independently with respect to pressure level of the main pressure conduit.